Adhesive binding tape



Nov. 22, 1932. 1 L 1,888,433

ADHESIVE BINDING TAPE Filed March 10, 1930 IIIIIIIII'III I AV YAVAVAVI:

gwuentoz Philip L. 0100 nne/l Patented Nov. 22, 1932 UNITED STATESPATENT OFFICE PHILIP I. ODONNELL, OF CINCINNATI, OHIO, ASSIGNOB TO PAROO00., O1 LYNN, MASSACHUSETTS, A. CORPORATION OF MASSACEUSE'I'IS ADHESIVE:emnmo TAPE The present invention relates to an improved adhesivebinding tape and has for an object the provision of a tape which carriesits own adhesive completely covering one 5 face but arranged in suchrelation as to eliminate the possibility of gumming the tape guide andneedle of sewinghmafchines used in stitching the tape along t e edge ofa sheet of material to be bound.

Another object is to provide a tape of the class described with acomposite adhesive coating comprising two side by side longitudinalstripes of heat plastic material one of which is thicker .or heavierthan the other.

Another object is to provide a composite coating wherein two stripes ofheat plastic adhesive together form a complete covering for one side ofthe tape and wherein the materials of the stripes carry a substancewhich 20 acts as a lubricant to facilitate guiding and stitching andwhich furthermore serves as a.

flux for the adhesive when subjected to heat so that the edge of thetape to be stitched may carry a greater quantity of this lubrieating Isubstance during the stitching operation and, upon heatingthe tape thislubricant may efi'ect a dispersion of the lubricating substanceuniformly through both applications ofadhesive. Another object is toprovide a fully coated heat plastic tape wherein the adhesive isrelatively thicker at one longitudinal side of the tape than at theother and wherein the adhesives carry a substance which will efiectsubstantially an even distribution of the adhesives over said face whenthe tape is subjected to heat. 7

These and other objects and advantages are attained by the meansdescribed herein and disclosed in the accompanying drawing in which:

Fig. 1 is an enlarged perspective view of a short section of the tape ofthis inventio prior to heating. Fig. 2 is a similar view showing thetape after it has been subjected to heat and ready 'for application.

In the preparation of the heat plastic French binding tape of theinvention the ribbon or tape 5 of silk or other suitable fabric of thedesired color is employed and may comprise a tape with a selvage 6 alongone edge, or along both edges as shown in the drawing. Extendinglongitudinally along one longitudinal edge 60 of the tape is a coatingor layer of heat plastic adhesive 7 which has in its composition asubstance which will 'act as a mechanical lubricant to avoid stitchingtrouble and tape guide trouble at the sewing machine when this tape isstitched along the selvage edge 60 to a sheet of material to be boundwith the tape. The lubricant may be any kind which is capable ofintimate mixture with the heat plastic adhesive and which will not bedriven out to stain and saturate the fabric of the tape when heated.Hydrocarbons of the parafiin series have been found to afl'ord excellentmechanical lubricant for the purpose and, in the adhesive compositionfor the coating 7 this lubricant is used in the proportion of about 8%per unit of heat plastic adhesive substance. It is to be noted here thatthis resulting heat plastic composition contains an abundance oflubricant for all working conditions, the most difficult of which ishigh atmospheric temperature. The width of this stripe or coating ofheat plastic adhesive with what may be termed a high lubricant contentmay be arbitrary set at slightly more than one-half the width of thetape. It will be understood that this width of coating is not absolutebut merely a desirable one. The thickness of this coating is preferablymuch less than 5 the distance from the face of the tape 5 to the topedge of the selvage 60. The thickness of the coating is preferably about.005 This is the edge which is to be stitched 'to the sheet and it isdesirable that the selvage 90.

60 be present to preclude tearing out of the stitching.

The opposite longitudinal edge of the tape 5 may have a selvage 6 or theselvage may be dispensed with as desired. A second longitudinal heatplastic adhesive coating 8 extends from the selvage edge 6 (or acorresponding serrated raw edge) and overlaps slightly the coating 7This coating 8 is preferably about .025 in thickness which brings thetop face of the coating 8 to about the level of the top of the selvage.The composition of the coating 8 includes the substance which will actas a flux so that upon heating of the tape the adhesive of both strips 7and 8 may intermingle and the lubricant in the strip 7 may interminglewith the flux adhesive 1n the coating 8. It has been found that if theheat plastic adhesive composition used in the strip 8 has incorporatedtherein about one-half of the amount of hydro-carbon lubricant substanceused in the coating 7 (i. e. about 4% hydro-carbon of the paraflinseries) an excellent flux" is provided.

In its broader aspects, the invention may be carried out by providing acovering for one complete face of the tape comprising two side by sidecoatings of heat plastic adhesive which are of different composition inthat the edge to be stitched contains a suficient amount of mechanicallubricant to assure free movement of the tape through the tape guide ofa sewing machine and free movement of the needle and thread through thetape covered by said adhesive, and the other adjacent adhesive coatingshall have incorporated in its composition a substance which shall serveto flux a coating and permit a mingling and homogenizing of the twocoatings when subjected to heat and to further ta e up the lubricantsufiiciently to assure good adhesion of the tape to the material towhich it is applied. In the embodiment herein disclosed the sameingredients in different proportions efiect these several results.

In making the binding tape of the present invention the thin adhesivecoating 7 with r the slight excess of lubricant may be applied first andthe remaining coat 8 may be applied afterward in slightly overlappingrelation if desired. In this way a very uniform prodnot is obtained asmay be noted by the relatlvely shiny or lustrous appearance of the faceof coating 8 and the relatively dull or lusterless face of the coating7.

The tape is stored on rolls or spools which may be mounted on the sewingmachine for delivering the tape as required as it is stitched along theselvage edge 60 to a shoe quarter or the like. During this time it willbe found that both surfaces are sufficiently lubricated to avoidadhesion.

The work with the binding tape of the invention is then submitted to aFrench foldor and the tape is preferably rendered plastic by theapplication of heat just prior to the turning and pressing of the tapeby the folding machine. One folding device for performing-this work isshown in my application Serial N 0. 363,236 filed May 15, 1929, whereinthe so-called rotary French folding machine is equipped with a tube ornozzle for directing a continuous stream of heated air to that face ofthe tape carrying the adhesive.

When the tape is subjected to heat, as just explained, or by holding itin a heated chamher or by holding a flame near it, the adhesive meltsand becomes tacky. Furthermore the two slightly different adhesivecompositions flux and the lubricant is dispersed substantially uniformlythroughout the two adhesive coatings which homogenize and tend to flowto a common level 87 It is possible, but not necessary, that the coatingwill become uniform in thickness entirely across the face of the ta e ifsuflicient heat is directed thereto. owever the dispersion of thelubricant appears to take place almost immediately upon application ofheat and the adhesive is homogenized so that the tape will adhere veryeffectively regardless of how rapidly it may be heated and folded ontothe shoe quarters or the like.

Upon adhesion of the tape to the shoe quarter and setting it will befound the total amount of lubricant which has now been distributedentirely across the tape is not sufiicient to bloom to an edge orsurface hence a very tenacious adhesion is effected.

As indicated in dotted lines at 9 in Fig. 1, the edge 6 may be serratedto any desired dzpth in lieu of a selvage or a straight raw e ge. i

What is claimed is:

1. As a new article of manufacture a heat plastic adhesive tape whereinone face of the tape is completely covered by two longitudinal coatingsof heat plastic adhesive in side by side relation, one of the coatingsbeing relatively thinner than the other, the thinner coating includingin its composition a substance serving as a mechanical lubricant forstitching when cold.

2. As a new article of manufacture a heat plastic binding tape one faceof which is completely covered by two longitudinal side by side layersof heat plastic adhesive, said layers being of different thickness, andthe adhesive of each layer being different in that a thick layercontains a small percentage of flux material and the thin layer containsarelatively larger percentage of lubricating substance, the adhesive,flux, and lubricant being of such nature as to homogenize upon theapplication of heat.

3. As a new article of manufacture a full coated heat plastic bindingtape having two side by side layers of heat plastic adhesive ofdifferent thickness, the adhesive of each layer having a hydrocarbon oftheparaflin series in a quantity inversely proportional to the thiclmessof the layer.

4. As a new article of manufacture a full coated heat plastic adhesivebinding tape comprising a fabric tape having on its one face two side byside contacting layers of adhesive substance extending longitudinallythereof, one layer being relatively thinner than the other and having inits composition a hydro-carbon substance which serves as a lubricantwhen the adhesive is cold and which may disperse uniformly throughoutboth layers upon heating of the tape.

In testimony whereof, I have hereunto subscribed my name this 6th day ofMarch, 1930.

PHILIP L. ODONNELL.

